﻿using SalamanderWnmp.Properties;
using SalamanderWnmp.Tool;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;

namespace SalamanderWnmp
{
    /// <summary>
    /// App.xaml 的交互逻辑
    /// </summary>
    public partial class SalamanderApp : Application
    {

        public SalamanderApp()
        {
            Process process = GetRuningInstance();
            if (process != null)
            {
                Settings s = new Settings();
                ShowWindowAsync((IntPtr)s.hMainWnd, SW_SHOWNORMAL);
                Environment.Exit(0);
            }
            DispatcherHelper.Initialize();
        }

        protected override void OnExit(ExitEventArgs e)
        {
            Settings s = new Settings();
            s.Reset();
            //Common.PHP.StopWatchPHPFCGINum();
            base.OnExit(e);
        }

        // API 常數定義
        private const int SW_HIDE = 0;
        private const int SW_SHOWNORMAL = 1;
        private const int SW_MAXIMIZE = 3;
        private const int SW_SHOWNOACTIVATE = 4;
        private const int SW_SHOW = 5;
        private const int SW_RESTORE = 9;


        private static void HandleRunningInstance(Process instance)
        {
            ShowWindowAsync(instance.MainWindowHandle, SW_SHOWNORMAL);// 显示
            SetForegroundWindow(instance.MainWindowHandle);// 当到最前端
        }


        /// <summary>
        /// 获取已经运行的进程实例
        /// </summary>
        /// <returns></returns>
        private static Process GetRuningInstance()
        {
            Process currentProcess = Process.GetCurrentProcess();
            Process[] Processes = Process.GetProcessesByName(currentProcess.ProcessName);
            foreach (Process process in Processes)
            {
                if (process.Id != currentProcess.Id)
                {
                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == currentProcess.MainModule.FileName)
                    {
                        return process;
                    }
                }
            }
            return null;
        }

        /// <summary>
        /// 该函数设置由不同线程产生的窗口的显示状态
        /// </summary>
        /// <param name="hWnd">窗口句柄</param>
        /// <param name="cmdShow">指定窗口如何显示。查看允许值列表，请查阅ShowWlndow函数的说明部分</param>
        /// <returns>如果函数原来可见，返回值为非零；如果函数原来被隐藏，返回值为零</returns>
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);



        /// <summary>
        ///  该函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号。
        ///  系统给创建前台窗口的线程分配的权限稍高于其他线程。 
        /// </summary>
        /// <param name="hWnd">将被激活并被调入前台的窗口句柄</param>
        /// <returns>如果窗口设入了前台，返回值为非零；如果窗口未被设入前台，返回值为零</returns>
        [DllImport("User32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
    }
}
